Fatigue notch sensitivity

Fujii T, Shina T, Okubo K. Fatigue notch sensitivity of glass woven fabric composite having a circular hole under tension/torsion biaxial loading. J Compos Mater 1994 28(3) 234-51. 

Marry, R.W., Dolan, T.J. The influence of grain size on fatigue notch sensitivity. Proc. ASTM 53, 789 (1953)... 

Mann, J.Y. The fatigue notch sensitivity of annealed copper. Proc. ASTM 60, 602 (1956)... 

Fig. 8.75 Relation between (k — l)/n) and tj in 1% NaCl, where k is the ratio of fatigue strength in air to that in a corrosive environment, the notch sensitivity factor on fatigue strength, the corrosion current density at start of fatigue cycling, and jy the total life in...

Endo, K., Komai, K. and Nakamuro, N., Estimation of corrosion fatigue strength from corrosion resistance and notch sensitivity of the materials . Bull. Jap. Soc. Mech. Eng., 13, 837-46 (1970)... 

This paper addresses three topics of current scientific and technological interest poly(vinyl chloride) (PVC) toughening of brittle or ductile but notch-sensitive polymers by the inclusion of rubbery phases and the kinetics of fatigue crack propagation (FCP). 

This section is organized as follows the basic physical characteristics are introduced, followed by discussions of uniaxial room temperature mechanical properties, the effect of long term thermal exposure, creep behavior, notch sensitivity, and fatigue performance. The significantly different off-axis, matrix-dominated properties are described in the final section. 

Many investigations have been made on the low-temperature properties of aluminum alloys [1-4] however, in addition to the determination of tensile and elastic properties as a function of temperature, notched tensile properties and notched/unnotched tensile ratios were determined. The notched/unnotched ratios were determined as a function of temperature in order to evaluate the toughness, which is often referred to in terms of resistance to brittle fracture, or notch sensitivity [5-7]. A notched specimen with a stress concentration factor K oi 6.3 was selected for use in this investigation because previous axial fatigue tests of complex welded joints, and fatigue and burst tests of pressure vessels made of 301 extra full hard stainless steel exhibited excellent correlation with notched/unnotched tensile ratios obtained with this value of over a range of temperatures... 

More extensive use of aluminum alloys for service at cryogenic temperatures has resulted in a need for more detailed information about their behavior in both the plain and welded conditions at these temperatures. For example, the moduli, fatigue strengths and those properties related to toughness, such as notch sensitivity and tear resistance, are of prime importance. These properties have been studied at the Alcoa Research Laboratories and a brief review of some of the more important findings follows. 

Polyamides are a very attractive class of engineering polymers because of their excellent tensile properties, chemical and abrasion resistance, high melting point and fatigue resistance. However, polyamides are very notch sensitive and brittle at low temperatures. Blends of different rubbers and polyamides have been studied to obtain good impact properties. Some requirements are an appropriate range of rubber particle size and a uniform distribution of it. These can be achieved by controlling the level of the interfacial adhesion between the phases. 

PC Better transparency Higher toughness and modulus Higher continuous use temperature Higher cost and density Notch sensitive Lower fatigue resistance... 

Moore, H.F. A study of size effect and notch sensitivity in fatigue test of steels. ASTM. Proc. 45, 507 (1945)... 

This actually means that if a notch sensitivity factor is introduced also for the fatigue finite life that, usually indicated as Idf, it will always be < Idfnotch sensitivity factor 4 at 1,000 cycles analogous to the q index already seen in Sect. 7.2 for the fatigue limit, so that it is... 

Peterson, R.E. Chapter 13 Notch sensitivity. In Metal Fatigue. McGraw-Hill, New York... 

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